Multiply (x+4)(x-4)

18. Which of the following answers correspond to \((x+4)(x-4)\)?

1. \(x^{2}+8x\)
2. \(x^{2}+8x-16\)
3. \(x^{2}+16\)
4. \(x^{2}-16\)
5. \(x^{2}-8x\)